Brake Disk Braking Surface Processing Device

ABSTRACT

The present invention provides enhancement of processing accuracy of a braking surface of a brake disk. A brake disk braking surface processing device  1  includes a rotation driving device  11  that rotates a brake disk  2,  a processing section  12  that processes braking surfaces  4  and  5  of the brake disk  2,  and pressing rollers  13  and  14  that press the braking surfaces  4  and  5  of the brake disk  2.  The brake disk braking surface processing device  1  includes the pressing rollers  13  and  14  that press the braking surfaces  4  and  5  of the brake disk  2.  Therefore, even when tools are pressed against the braking surfaces  4  and  5  in a direction perpendicular to the braking surfaces  4  and  5,  deformation of the braking surfaces  4  and  5  of the brake disk  2  can be suppressed with certainty. As a result, processing accuracy of the braking surfaces  4  and  5  of the brake disk  2  can be enhanced.

TECHNICAL FIELD

The present invention relates to a brake disk braking surface processingdevice.

BACKGROUND ART

Generally, in a braking device of an automobile, a brake pad is pressedagainst a braking surface on both sides of a brake disk rotor attachedto a wheel using hydraulic pressure, thereby slowing or stopping amovement of the brake disk rotor (wheel). A driver operating a brakepedal performs this operation. Therefore, the braking surface isrequired to be processed (by grinding or cutting) such that the brakedisk rotor does not shake from a shaft center when the brake pad ispressed against the braking surface of the brake disk rotor.

For example, as shown in FIG. 1, a brake disk braking surface processingdevice 1 rotates a hub unit 3 on which a brake disk 2 is mounted. Tools6 are pressed against braking surfaces 4 and 5 of the brake disk 2. As aresult, processing such as grinding and cutting are performed. A similarbrake disk braking surface processing device is disclosed in JapanesePatent Laid-open Publication No. 2002-210639.

Patent Document 1: Japanese Patent Laid-open Publication No. 2002-210639DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention

When the braking surfaces 4 and 5 of the disk brake 2 are processed, apressing roller 8 presses against an outer peripheral side surface 7 ofthe brake disk 2, as shown in FIG. 1, to suppress shaking of the brakedisk 2.

However, when the braking surfaces 4 and 5 are ground or cut by a toolpressing the braking surfaces in a direction perpendicular to thebraking surfaces, a pressing force is applied to the braking surfaces 4and 5 in the direction perpendicular to the braking surfaces. Therefore,even when the pressing roller 8 presses in a radial direction from theouter peripheral side surface 7, deformation of the braking surfaces 4and 5 of the disk brake 2 may not be sufficiently suppressed.

When the outer peripheral side surface 7 of the brake disk 2 has ascratch, or when the outer peripheral side surface 7 of the brake disk 2is painted and has a paint spot, the outer peripheral side surface 7 ofthe brake disk 2 may be uneven. In this case, in the method in which thepressing roller 8 presses against the outer peripheral side surface 7 ofthe brake disk 2, the pressing force from the pressing roller 8 changesbecause of the unevenness. Therefore, the brake disk 2 may chatter.

When a rotational center of the brake disk 2 and a center of the outerperipheral side surface 7 of the brake disk 2 are misaligned, or whenthe brake disk 2 is not mounted perpendicular to a rotation axis, thebrake disk 2 swings vertically in adherence to rotation at a portionagainst which the pressing roller 8 is pressing. In this case, when thebrake disk 2 swings vertically by a large amount, the pressing roller 8does not come into even contact with the outer peripheral side surface 7of the brake disk 2. The swinging of the brake disk 2 cannot besuppressed, and the brake disk 2 may chatter.

Means for Solving the Problems

A brake disk braking surface processing device of the invention includesa rotation driving device, a processing section, and a pressing roller.The rotation driving device rotates a brake disk. The processing sectionprocesses a braking surface of the brake disk. The pressing rollerpresses the braking surface of the brake disk.

The pressing roller can be provided before a processing position of theprocessing section and can press against a pre-processing position. Thepressing roller can be supported such as to follow a vertical swingingof the brake disk that accompanies rotation. The pressing roller canalso be a crowned roller.

ADVANTAGE OF THE INVENTION

The brake disk braking surface processing device includes the pressingroller that presses the braking surface of the brake disk. Therefore,deformation of the braking surface of the brake disk can be suppressedwith certainty, even when a tool presses against the braking surface ina direction perpendicular to the braking surface. As a result,processing accuracy of the braking surface of the brake disk can beenhanced.

When the pressing roller is provided before the processing position ofthe processing section and presses against the pre-processing position,the processing section processes a portion against which by the pressingroller has pressed. Therefore, even when the pressing roller scratchesthe braking surface, the processing section can remove the scratch.

When the pressing roller is supported such as to follow the verticalswinging of the braking surface of the brake disk that accompaniesrotation, the pressing roller can press the brake disk even when thebrake disk swings vertically in accompaniment to the rotation.Therefore, shaking of the brake disk can be prevented with certainty.When the pressing roller is the crowned roller, concentration of stressapplied to the braking surface of the brake disk by the pressing rollercan be reduced. Therefore, the braking surface of the brake disk can beprevented from becoming scratched.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram of a brake disk braking surface processing device;

FIG. 2 is a vertical cross-sectional view of a brake disk brakingsurface processing device according to an embodiment of the presentinvention;

FIG. 3 is a vertical cross-sectional view of another configuration of ahub unit;

FIG. 4 is a vertical cross-sectional view of a brake disk unit; and

FIG. 5 is another embodiment of a pressing roller.

BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of a brake disk braking surface processing deviceaccording to the present invention will be hereinafter described indetail, with reference to the drawings. Components and sections withinthe drawings performing same operations are given same referencenumbers.

As shown in FIG. 2, a brake disk braking surface processing device 1includes a rotation driving device 11, a processing section 12, andpressing rollers 13 and 14.

The rotation driving device 11 rotates the brake disk 2. According tothe embodiment, as shown in FIG. 2, the rotation driving device 11supports a hub unit 3 on which the brake disk 2 is mounted. A splinehole 21 is formed in the hub unit 3, shown in FIG. 2, in a center axialdirection. A rotation driving axis (not shown) of the rotation drivingdevice 11 is connected to the spline hole 21 of the hub unit 3. Therotation driving device 11 rotates the hub unit 3. As shown in FIG. 3,some hub units 3 do not have the spline hole 21. In this case, incorrespondence with the hub unit 3 that has no spline hole 21, therotation driving device 11 can support a rotation axis of the hub unit 3and rotate the hub unit 3. The rotation driving device 11 can include amounting section for setting a brake disk 2 unit and rotate the brakedisk 2 as a single unit, as shown in FIG. 4.

The processing section 12 processes the braking surfaces 4 and 5 of thebrake disk 2. According to the embodiment, tools 6 are mounted on theprocessing section 12 such as to sandwich the upper and lower brakingsurfaces 4 and 5 of the brake disk 2. The processing section 12 cansimultaneously process the upper and lower braking surfaces 4 and 5. Theprocessing section 12 simultaneously processes the upper and lowerbraking surfaces 4 and 5 in a circumferential direction in accompanimentto the rotation of the brake disk 2 by the rotation driving device 11.The processing section 12 gradually moves in a radial direction andprocesses the entire surfaces of the braking surfaces 4 and 5. Accordingto the embodiment, the processing unit 12 performs processing, graduallymoving from an outer diameter side to an inner diameter side of thebrake disk 2. A cutting tool or a grinding tool, for example, can beused as the tools mounted on the processing section 12.

The pressing rollers 13 and 14 press the braking surfaces 4 and 5 of thebrake disk 2. According to the embodiment, the pressing rollers 13 and14 face each other, forming a pair above and below the brake disk 2 suchas to sandwich the upper and lower braking surfaces 4 and 5 of the brakedisk 2. The pressing rollers 13 and 14 are roller components. Thepressing rollers 13 and 14 rotate such as to follow the rotation of thebrake disk 2, while sandwiching the brake disk 2 from above and below.

According to the embodiment, the pressing rollers 13 and 14 are providedin positions misaligned with the processing section 12 in thecircumferential direction. As is the processing section 12, the pressingrollers 13 and 14 gradually move in the radial direction, from the outerdiameter side to the inner diameter side, in adherence to the rotationof the brake disk 2. The pressing rollers 13 and 14 always press thebraking surfaces 4 and 5 of the brake disk 2 at pre-processing position.In this case, should the pressing rollers 13 and 14 scratch the brakingsurfaces 4 and 5 of the brake disk 2, the scratched portion is processedby the processing section 12. Therefore, the scratch on the brakingsurfaces 4 and 5 can be removed.

The brake disk 2 may swing vertically in accompaniment to the rotation.The pressing rollers 13 and 14 can be supported such as to swingvertically in adherence to the swinging of the brake disk 2. Supportingsections 15 and 16 of the pressing rollers 13 and 14 support thepressing rollers 13 and 14 via an elastic supporting component, such asa cylinder or a spring, thereby allowing the pressing rollers 13 and 14to swing elastically in the vertical direction. Therefore, even when thebrake disk 2 swings vertically, the pressing rollers 13 and 14 swing inadherence to the swinging. Therefore, the braking surfaces 4 and 5 ofthe brake disk 2 can be prevented from becoming scratched.

The brake disk braking surface processing device 1 includes the pressingrollers 13 and 14 that press the braking surfaces 4 and 5 of the brakedisk 2. Therefore, deformation of the braking surfaces 4 and 5 of thebrake disk 2 can be suppressed with certainty in correspondence with theprocessing section that presses the tools in the direction perpendicularto the braking surfaces 4 and 5. As a result, processing accuracy of thebraking surfaces 4 and 5 of the brake disk 2 can be significantlyenhanced.

According to the embodiment, the pressing rollers 13 and 14 are providedbefore the processing position of the processing section 12 and pressagainst the pre-processing position. Therefore, even when the pressingrollers 13 and 14 scratch the braking surfaces 4 and 5 of the brake disk2, the scratch can be removed when the processing section 12 processesthe braking surfaces 4 and 5 of the brake disk 2.

According to the embodiment, even when the braking surfaces 4 and 5 ofthe brake disk 2 swing vertically in accompaniment to the rotation, thepressing rollers 13 and 14 are supported such as to follow the swingingof the braking surfaces 4 and 5. Therefore, even when the brake disk 2swings vertically in accompaniment to the rotation, the pressing rollers13 and 14 follow the swinging, thereby preventing the brake disk 2 fromshaking with certainty.

The brake disk braking surface processing device according to anembodiment of the invention is described with reference to the drawings.However, the brake disk braking surface processing device of theinvention is not limited to the above-described embodiment.

For example, as shown in FIG. 5, the pressing rollers 13 and 14 can becrowned rollers. In this case, concentration of stress applied to thebraking surfaces 4 and 5 of the brake disk 2 from the pressing rollers13 and 14 can be reduced. The braking surfaces 4 and 5 of the brake disk2 can be prevented from becoming scratched.

1. A brake disk braking surface processing device comprising: a rotationdriving device that rotates a brake disk; a processing section thatprocesses a braking surface of the brake disk; and a pressing rollerthat presses the braking surface of the brake disk.
 2. The brake diskbraking surface processing device according to claim 1, wherein thepressing roller is provided before a processing position of theprocessing section and presses against a pre-processing position.
 3. Thebrake disk braking surface processing device according to claim 1,wherein, even when the brake disk swings vertically in accompaniment tothe rotation, the pressing roller is supported such as to follow theswinging of the brake disk.
 4. The brake disk braking surface processingdevice according to claim 1, wherein the pressing roller is composed ofa crowned roller.